30. It is the test system, rather than the teachers,______is to blame for the students’ heavy burden nowadays.
When she first arrived in China, she wondered what the future might have_________for her, but now all her worries are gone.
A great man shows his greatness ________ the way he treats little men.
If you really have to leave during the meeting, you’d better leave ____ the back door.
Fred entered without knocking and, very out of breath, sank _______ a chair.
People try to avoid public transportation delays by using their own cars, and_____ this creates further problems.